Popular Post PeterBolt Posted May 7, 2021 Popular Post Share Posted May 7, 2021 (edited) 60x300s captured with my Canon EOS 1000D (modified), 200P and Celestron AVX. I think my star shape is improving. I made some further adjustments to the primary mirror clips and also dialled down the dither - reducing the aggressiveness and allowing it more time to settle. Last night was also my first attempt at a scheduled meridian flip which was amazing to watch! I really do like N.I.N.A. I did however notice that although my guiding in RA was consistent on both sides of the meridian my guiding in DEC was noticeably worse after the flip. Any ideas? Edited May 7, 2021 by PeterBolt 10 Quote Link to comment Share on other sites More sharing options...
TerryMcK Posted May 7, 2021 Share Posted May 7, 2021 Are you using PHD2 Peter? If so you can upload the guide logs to the thread. They can be analysed with a tool from PHD2. 1 Quote Link to comment Share on other sites More sharing options...
Marmot Posted May 7, 2021 Share Posted May 7, 2021 Can’t help you on the technical stuff, but what a great picture! 1 Quote Link to comment Share on other sites More sharing options...
Padraic M Posted May 7, 2021 Share Posted May 7, 2021 As Terry said, worth uploading your logs, but also review the PHD2 Best Practices guide. I haven't noticed any difference in Dec guiding pre/post a flip, but the thing that comes to mind is Dec balance. As far as I can remember, if you're West facing East pre a flip, and you're scope-heavy you are constantly in contact with the worm drive so Dec backlash doesn't play a part, but after the flip and you're East facing West, gravity and backlash could cause some short jerks as the scope front-end 'falls' away from the worm. This is covered in the PHD2 guide and in lots of forum posts here. Oh and great photo! Love the detail. 2 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted May 7, 2021 Share Posted May 7, 2021 Lovely image Peter, I think Padraic is right regarding the pre/post flip guiding. The ideal situation would be to have a small weight that will automatically move up/down the shaft depending on if you are East or West side. 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 43 minutes ago, TerryMcK said: Are you using PHD2 Peter? If so you can upload the guide logs to the thread. They can be analysed with a tool from PHD2. Thank you for your reply. Yes I am using PHD2. I will try to upload the log file to the thread 👍 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 38 minutes ago, Marmot said: Can’t help you on the technical stuff, but what a great picture! That's really kind thank you😀 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 34 minutes ago, Padraic M said: As Terry said, worth uploading your logs, but also review the PHD2 Best Practices guide. I haven't noticed any difference in Dec guiding pre/post a flip, but the thing that comes to mind is Dec balance. As far as I can remember, if you're West facing East pre a flip, and you're scope-heavy you are constantly in contact with the worm drive so Dec backlash doesn't play a part, but after the flip and you're East facing West, gravity and backlash could cause some short jerks as the scope front-end 'falls' away from the worm. This is covered in the PHD2 guide and in lots of forum posts here. Oh and great photo! Love the detail. Interesting I will have a look at the balance. I have been concentrating on East West but perhaps I need to focus more on DEC. Thank you for your feedback. Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 13 minutes ago, MarkAR said: Lovely image Peter, I think Padraic is right regarding the pre/post flip guiding. The ideal situation would be to have a small weight that will automatically move up/down the shaft depending on if you are East or West side. OK thanks I will look into this idea... Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 (edited) Here's the PHD2 guide log from last night (i have just removed a spike where the scope hit the mount) PHD2_GuideLog_2021-05-06_211557_Edit.txt Edited May 7, 2021 by PeterBolt Quote Link to comment Share on other sites More sharing options...
GazAstro Posted May 7, 2021 Share Posted May 7, 2021 Nice capture and pretty amazing guiding for an AVX carrying a 200mm reflector ! I'd be more than happy with that. Before flip After flip If you can improve it then probably dec balance maybe. Cant see the dec aggression setting on log viewer but maybe increase if not on 100% already as it is taking quite a few adjustments to actually move in dec ( or possibly backlash ?) But honestly thats sweet guiding already, you will be hard pushed to inmprove it 🙂 1 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 (edited) 40 minutes ago, GazAstro said: Nice capture and pretty amazing guiding for an AVX carrying a 200mm reflector ! I'd be more than happy with that. Before flip After flip If you can improve it then probably dec balance maybe. Cant see the dec aggression setting on log viewer but maybe increase if not on 100% already as it is taking quite a few adjustments to actually move in dec ( or possibly backlash ?) But honestly thats sweet guiding already, you will be hard pushed to inmprove it 🙂 Thanks for the feedback. I spent a few nights playing around with the settings during the full moon last month. I ended up with DEC aggression at 100%. I also found that guiding was much better with the exposure set to 0.5s which might be going against the advice for the better mounts? Multi star guiding made a massive difference and I am currently trying predictive PEC for RA. I might also try training the PEC in the hand controller next time out to see if that makes any difference - will this fight with PHD2? At the moment I am using the spiral dither option which seems to help in DEC. Edited May 7, 2021 by PeterBolt Quote Link to comment Share on other sites More sharing options...
peter shah Posted May 7, 2021 Share Posted May 7, 2021 thats a lovely shot Peter 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 11 minutes ago, peter shah said: thats a lovely shot Peter Thank you 😃 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted May 7, 2021 Share Posted May 7, 2021 Very nice image Peter. 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 57 minutes ago, AstronomyUkraine said: Very nice image Peter. Thank you, I think the EAF is definitely helping! 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted May 7, 2021 Share Posted May 7, 2021 7 minutes ago, PeterBolt said: Thank you, I think the EAF is definitely helping! I will have mine next week. Then I can remove the one I currently have installed. Also one cable less to worry about. 1 Quote Link to comment Share on other sites More sharing options...
Carastro Posted May 7, 2021 Share Posted May 7, 2021 Really nice result. Well done. Carole 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 23 minutes ago, AstronomyUkraine said: I will have mine next week. Then I can remove the one I currently have installed. Also one cable less to worry about. Sounds good! Thanks for all your advice by the way! 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 7, 2021 Author Share Posted May 7, 2021 15 minutes ago, Carastro said: Really nice result. Well done. Carole Thank you 👍 Quote Link to comment Share on other sites More sharing options...
Dmack1 Posted May 8, 2021 Share Posted May 8, 2021 Nice image. Great structure in the disc. 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 8, 2021 Author Share Posted May 8, 2021 1 hour ago, Dmack1 said: Nice image. Great structure in the disc. Thank you Quote Link to comment Share on other sites More sharing options...
paul Posted May 9, 2021 Share Posted May 9, 2021 Lovely image Peter, good detail with lots of flocculence. I was trying for the same target Thursday night but the predicted 3hrs clear became 1hr of intermittent clouds. Time is running out this side of summer! 1 Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 9, 2021 Author Share Posted May 9, 2021 7 hours ago, paul said: Lovely image Peter, good detail with lots of flocculence. I was trying for the same target Thursday night but the predicted 3hrs clear became 1hr of intermittent clouds. Time is running out this side of summer! Yes it's a shame as I have really enjoyed galaxy season Quote Link to comment Share on other sites More sharing options...
PeterBolt Posted May 17, 2021 Author Share Posted May 17, 2021 The weather has been pretty awful here recently so I haven't been able to get any more data. I did however have another go at processing to try and bring out some more of the details. 6 Quote Link to comment Share on other sites More sharing options...
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